Bad child care is the nightmare from which no mother can escape. The professional who can run a business or save a life . . . the mother who can organize a community fund-raiser while entertaining two toddlers and nursing a baby—no matter how thoroughly they've investigated a nanny, no matter how many years they've known their sitter, all walk out the door haunted by the specter that the sitter or staff member to whom they've entrusted their most precious responsibility is a Hyde masquerading as a Jekyll, or otherwise not the women they thought her to be.